12... g8g7  13. h2h3 A curious theoretical novelty. Firouzja invites Black to take the knight once again and, in addition, offers an alternative: capturing the pawn on h3. 13... g4f3  14. d1f3  14... c8e6 White has only one pawn for the piece, but Black has no simple way to get out of the pin. There's usually a theme of repeating moves with Qg3+ followed by Qf3, so White is risking less than it seems at first glance.